What would you advise a breastfeeding woman with localized HR+ breast cancer in terms of risk of progression with breastfeeding prior to local therapy with surgery?  

For every 12 months of breastfeeding, the risk of developing breast cancer is lowered by about 4%. I know of no data that describes increased risks of progression prior to surgery regarding ER-positive breast cancer. However, the breasts are engorged during breastfeeding, and they involute when stop...